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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.bcpg;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;

/**
 * base class for an EC Secret Key.
 */
public class ECSecretBCPGKey
    extends BCPGObject
    implements BCPGKey
{
    MPInteger x;

    /**
     * @param in
     * @throws IOException
     */
    public ECSecretBCPGKey(
        BCPGInputStream in)
        throws IOException
    {
        this.x = new MPInteger(in);
    }

    /**
     * @param x
     */
    public ECSecretBCPGKey(
        BigInteger x)
    {
        this.x = new MPInteger(x);
    }

    /**
     * return "PGP"
     *
     * @see org.spongycastle.bcpg.BCPGKey#getFormat()
     */
    public String getFormat()
    {
        return "PGP";
    }

    /**
     * return the standard PGP encoding of the key.
     *
     * @see org.spongycastle.bcpg.BCPGKey#getEncoded()
     */
    public byte[] getEncoded()
    {
        try
        {
            ByteArrayOutputStream bOut = new ByteArrayOutputStream();
            BCPGOutputStream pgpOut = new BCPGOutputStream(bOut);

            pgpOut.writeObject(this);

            return bOut.toByteArray();
        }
        catch (IOException e)
        {
            return null;
        }
    }

    public void encode(
        BCPGOutputStream out)
        throws IOException
    {
        out.writeObject(x);
    }

    /**
     * @return x
     */
    public BigInteger getX()
    {
        return x.getValue();
    }
}